<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页
            </el-breadcrumb-item>
            <el-breadcrumb-item>权限管理
            </el-breadcrumb-item>
            <el-breadcrumb-item>角色列表
            </el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色
                    </el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="roleList" border stripe row-key="id">
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template v-slot:default="scope">
                        <el-row
                            :class="['bdbottom',i1 === 0 ? 'bdtop':'','vcenter']"
                            v-for="(item1,i1) in scope.row.children"
                            :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable
                                    @close="removeRightById(scope.row, item1.id)">
                                    {{item1.authName}}
                                </el-tag>
                                <i class=" el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <el-row
                                    :class="[i2 === 0 ? '': 'bdtop','vcenter']"
                                    v-for="(item2, i2) in item1.children"
                                    :key="item2.id">
                                    <!-- 二级权限 -->
                                    <el-col :span="6">
                                        <el-tag type="success" closable
                                            @close="removeRightById(scope.row, item2.id)">
                                            {{item2.authName}}
                                        </el-tag>
                                        <i class=" el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 三级权限 -->
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3)
                                        in item2.children" :key="item3.id"
                                            closable
                                            @close="removeRightById(scope.row, item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index">
                </el-table-column>
                <el-table-column label="角色名称" prop="roleName">
                </el-table-column>
                <el-table-column label="角色描述" prop="roleName">
                </el-table-column>
                <el-table-column label="操作" width="300px">
                    <template v-slot:default="scope">
                        <el-button size="mini" type="primary"
                            icon="el-icon-edit">编辑
                        </el-button>
                        <el-button size="mini" type="danger"
                            icon="el-icon-delete">
                            删除</el-button>
                        <el-button size="mini" type="warning"
                            icon="el-icon-setting"
                            @click="showSetRightDialog(scope.row)">
                            分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog title="提示" :visible.sync="setRightDialogVisible" width="50%"
            @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox
                node-key="id" default-expand-all :default-checked-keys="defKeys"
                ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">
                    取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定
                </el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
import LoginVue from '../Login.vue'
export default {
    data() {
        return {
            // 所有角色列表数据
            roleList: [],
            // 控制分配权限对话框
            setRightDialogVisible: false,
            // 所有权限的数据
            rightslist: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点ID值数组
            defKeys: [],
            // 角色的id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        // 获取所有角色的列表
        async getRolesList() {
            const { data: res } = await this.$http.get('roles')
            if (res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败')
            }
            this.roleList = res.data
        },
        // 根据ID删除对应的权限
        async removeRightById(role, rightId) {
            // 弹框提示用户是否要删除
            const confirmResult = await this.$confirm(
                '此操作将永久删除该文件, 是否继续?',
                '提示',
                {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }
            ).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('取消了删除！')
            }

            const { data: res } = await this.$http.delete(
                `roles/${role.id}/rights/${rightId}`
            )
            if (res.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            }

            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            const { data: res } = await this.$http.get('rights/tree')

            if (res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败')
            }
            // 获取到的权限数据保存到data中
            this.rightslist = res.data
            console.log(this.rightslist)
            // 递归获取三级节点的id
            this.getLeafKeys(role, this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id
        getLeafKeys(node, arr) {
            if (!node.children) {
                return arr.push(node.id)
            }

            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        // 监听分配权限对话框的关闭
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.join(',')

            const { data: res } = await this.$http.post(
                `roles/${this.roleId}/rights`,
                {
                    rids: idStr
                }
            )
            if (res.meta.status !== 200) {
                return this.$message.error('分配权限失败')
            }
            this.$message.success('分配权限成功')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang='less' scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>
